According to the PCM-A/D-12/16 Operations Manual:
NOTE: On the PCM-A/D-12 the lower nibble of the hex value will always be 0.
Fix the pcmad_ai_insn_read() function to properly handle this by shifting
the data after it has been read.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/pcmad.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/staging/comedi/drivers/pcmad.c b/drivers/staging/comedi/drivers/pcmad.c
index 8028e47..c9af0aa 100644
--- a/drivers/staging/comedi/drivers/pcmad.c
+++ b/drivers/staging/comedi/drivers/pcmad.c
@@ -104,6 +104,10 @@ static int pcmad_ai_insn_read(struct comedi_device *dev,
val = inb(dev->iobase + PCMAD_LSB) |
(inb(dev->iobase + PCMAD_MSB) << 8);
+ /* data is shifted on the pcmad12, fix it */
+ if (s->maxdata == 0x0fff)
+ val >>= 4;
+
if (pcmad_range_is_bipolar(s, range)) {
/* munge the two's complement value */
val ^= ((s->maxdata + 1) >> 1);
--
1.8.1.4
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